Brake for phonographs.



F. KRAFI.

BRAKE FOR PHONOGRAPHS.

APPLICATION FILED AUG.16. 1916.

Patented Jan. 30, 1917..

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Beans ron rnonoennrns.

specification of matters Eatent.

Patented Jan. 33, 121?.

Application filed August 16, 1916. Serial No. 115,125.

automatically set at the end of the inward sweep of'the tone arm. Thissweep varies in length for different lengths of records,

and means have therefore been devised, for causing the brake .-to becorrectly set irrespective of the length of the tone arm sweep. In otherwords, the brake will be automatically applied on records of greater aswell as of less length or whenever the piece of music is finished.

In the accompanying drawing: Figure 1 is a horizontal section of a brakeembodying my invention, taken in a plane above the turn table of aphonograph; Fig. 2, a vertical section partly in side View; Fig. 3, ahorizontal section through the tone arm showing adjoining parts, andFig. 4, a wiring diagram.

The cabinet of the phonograph is furnished with the usual to 1, throughwhich passes the spindle 2, o the turn table 3, which spindle is drivenin suitable'manner. To top 1 there is secured, a plate 4 to which ispivoted at 5, a brake lever 6 having a handle 7. Lever 6 is providedwith a brake shoe 8, of suitable construction which is adapted to beprojected against the edge of the turn table 3, by means of a spring 9,which is shown to be secured at one end toplate 4 and at the other endto handle 7. To lever 6 there is pivoted one end of a rod or brakecontrolling member 10 passing diametrically beneath turn table 3, andhaving an elongated eye 11 for the accommodation of spindle 2. The otherend of rod 10, is provided-with a spring arm 12, to which is secured abeveled head 13 constituting a spreading bolt. This head is adapted toengage an abutment comprising a notched sleeve 14: rotatably mountedupon pin 15,

that extends upwardly from top 1, the sleeve being influenced by aspring 16. Sleeve 14 is-provided with a tail piece 17 which is adaptedto be engaged by a split collar or tripping member 18 shiftablyencircling the tone arm 19. This collar is formed of two sectionshingedly connected at one of their Through ends 21, passes a pin 22,which by means of springs 23, has a tendency to contract the collar uponthe tone arm.

The operation is as follows: When the machine is playing, head 13engages notch 24 of sleeve 14, which will cause rod 10 to be soadvanced, against action of spring 9, that brake 8 is held ofl' turntable 3 (Fig. 2). When the tone arm has reached the end of its path,tripper 21 will strike tail 17, so as to turn sleeve 14 (against actionof spring 16) and dislodge head 13 from notch 24, the sleeve being byits spring 16 immediately returned to its normal position, after thisdislodgment has been eflected. The release of the head 13 from thesleeve 14;, will efiect the release of rod 10, so that spring 9 will nowretract the same and swing lever 6 inward to carry brake shoe 8 againstturn table 3. As soon as the head 13 has relinquished sleeve 14, it willpass between the ends 21 of collar 18 (Fig. 3) and thus spread thelatter against action of springs 23, the collar being thus loosened uponthe tone arm 19 but being arrested in position by the interposition ofthe head 13. A new record is now fitted upon the turn table and the tonearm is swung inward so that the stylo is brought opposite the end ofsuch new record, the movement of the tone arm being not participated inby the collar. The brake is released by hand lever 7, thus pulling head'13 out of collar 18, and causing the lat ter to be again tightened uponthe tone arm by springs 23, while the head will become reengaged bysleeve 14:. The motor is started and the tone arm is swung to thebeginning of the record carrying the collar 18 with it, whereupon theiece is played and the operation described is repeated. 7

lit will be seen that the collar 18 will trip the brake controllingmeans, as soon as the tone arm has reached the end of its path and thatthe collar will be set automatically in such a manner that it will becarried in due time against the brake controlling means, irrespective ofthe length of the tone arm stroke. in this way, the brake will bepromptly applied at the end of longeras well as of shorter records. incase the turn table is operated by an electric motor, the brake may beso connected to the motor that there is provided, a contact 25, which issep- 7 arated from plate 4 by insulation 26, and is connected to themotor-by wire 27 (Fig. 4),

while a second wire 28 leads from lever 24.

through the source of power to the motor. When the brake is off, thecircuit will thus be closed, and the motor started.

I claim: i

1. A phonograph comprising a turn table, a brake, a tone arm, a trippermounted on the tone arm and adapted to be normally in operativeengagement therewith, and brake controlling means ada ted to arrest thetripper' and simultaneous y break its operative engagement with the tonearm.

2. A phonograph comprising a turn table, a brake, a tone arm, a splitcollar mounted and a spreader operatively connected to the brake, saidspreader being adapted to arrest the collar, and to simultaneously breakits frictional engagement with the tone arm.

3. A phonograph comprisin a. turn table, a brake, a tone arm, a trippertted upon the tone arm, and means operable by the brake for looseningsaid tripper to permit an independent movement of the tone arm.

4; A phonograph comprising a turn table, a brake, a tone arm,-a trippingmember movably mounted thereon, and means operable by the brake forsimultaneously loosening and arresting the tripping member.

5. A phonograph comprising a turn table, a. brake, a brake setting rod,a tone arm a split collar movable on the tone arm, an a 1 head carriedby the brake setting rod and adapted to simultaneously spread and arrestthe collar; I

'6. A phonograph comprising a turn table,

a spring-influenced brake, a rod connected thereto, a head carried bythe rod, a movable abutment adapted to be engaged by head, a tone arm, acollar movably fitted 'upon the tone arm and adapted to be engaged bythe head,'said collar being adapted to actuate said abutment. on thetone arm and adapted to be taken along thereby through frict1onalcontact,

tone arm and adapted to be engaged by the head, said collar beingadapted to engage the tail piece.

FREDERICK KRAFT.

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